Means for indicating the temperatures of distant or inaccessible places



Aug. 31 1926.

'J..T. Fox ET AL. MEANS FOR INDICATING THE TEMPERATURES OF DISTANT OR INACCESSIBL E PLACES Filed Oct 6, 1923 Wan Patented Aug. 31, 1926.

UNITED stares earner @FFEQE,

JAMES TREVELYAN FOX AND ARTHUR JENNENS MALONE, OF NEWOASTIiE0N-TYNE,

' ENGLAND.,

MEANS FOR INDICA'IING THE TEMBEBA'IUEES OF DISTANCE OR INACCESSIBLE PLACES.

Application filed Octoberfi, 1923, Serial No. 687,035, and in Great Britain March 17, 1923 The invention relates to means for indi eating the temperature sible places.

of distant or inaces- According to the invention, a bulb is inserted at the position of which tl ie temperature is required, the bulb containing a liquid of which the vol temperature. The bulb ume varies with the is connected wlth a vessel, containing mercury or other suitable liquid, the level of which varies with the changes of volume of tained in the bulb and the substance conmeans are provided for causing air to flow upwards through the liquid in the blower, the pressure of the air being indicated in a gauge,

which may be placed in any required position relatively to the bulb and the liqu The arrangements are id containing vessel. such that the difference between the pressure of the air flowing through the liquid and t sure depends on the height he atmospheric presot the column of liquid in the liquid containing vessel above the point at which the same, the temperature of air tube enters the the bulb when the level of the liquid in the said vessel is at the junction of the air tube corresponding to the zero of the scale on In one construction invention the upper part the gauge.

according to the of the liquid contaming vessel communicates with the surrounding atmosphere and a tube otfine bore connects the lower end of the said vessel with the indicating gauge and is branched to an air air is raised sutficlently upwards through the mercury, in the vessel.

gauge, which may barometer tube of the atmosphere and the pump by which the pressure of the to enable it to flow liquid, preferably The indicating conveniently be a siphon which one leg is open to other leg to the con-,

necting air tube, consequently, shows the excess of this air pressure above the atmosphere and this pressure depends upon the changes of volume or stance in the bulb.

pressure of the sub- In a modified construction, the upper end of the vessel is connected to the air tube and the lower end of the vessel to a vertical tube open at the top to the atmosphere. In this arrangement the air tube is branched to the condenser of a steam engine or other means for reducing the press below atmospheric.

are in the air tube in the leg according to the invention.

The drawing is an elevation, partly in section, of one embodiment of the invention.

Referring to thedrawing, A is the thermometer bulb of which the upper part 66 is adapted to be screwed .into a vessel of which the temperature is to be indicated. "In the example illustrated the bulb is assumed to be lillled with mercury and to be made of stee.

A tube B of small bore is connected to the top of the bulb and is inserted in the bottom of the vessel 0, the upper part 0 of which is enlarged and contains bafiie plates D to prevent the liquid from splashing. A cover plate E closes the upper end of the vessel and is connected to the atmosphere by a short pipe or aperture 6.

A tube F of small bore opens into the interior of the vessel C near the bottom of the latter and is connected to one leg 9 of a siphon barometer gauge G, the other leg 9 of which is open to the atmosphere.

A branch tube f leads from the connecting tube F to an air pump H or to a supply of air under pressure.

The mercury fills the bulb A and connecting tube B and, at the lowest temperature to be indicated, extends into the vessel G to a level just beyond the connection with the lower end of the connecting tube F. As the temperature to be indicated increases the mercury column rises correspondingly and at the temperature assumed stands at a height w above the lower end of the tube F.

In order that the required temperature may be shown on the barometric gauge, air is pumped into the tube F by the air pump- H, bubbles through the mercury column a: and escapes by the pipe 6. The pressure of the air in the tube F is consequently dependent only on the height pressure is communicated to the the leg by the mercury in 9 of the gauge G and is indicated reading of the level of the mercury 9 on a scale I graduated in degrees of temperature.

The barometer gauge shown may be replaced by any other known device suitable for indicating pressures and liquids other than mercury may be used in the vessel C.

w and this cross section It is obvious that the indicating device may be in any required position and at any distance from the thermometer, and that the same indicating device may be used in connection with more than one thermometer bulb.

Having thus described the nature ofthe said inventionv and the best, means we know of carrying the same into practical effect, we claim 2 a 1. For the purpose of indicating the temperature of a distant or inaccessible place, a bulb containing aliquid, vessel communieating with the bulb and having a horizontal containing a liquid such as; mercury, the level of which varieswiththe ehangesof volume of the liquid contained in the bulb,- means ior causing a r tov flow into the liquid in the vessel, and means controlled by the, presless than that oi the bulb and sure of the said air for indicating tem-- perature.

2. For the purposeof indicating the temperature of a distant or inaccessible place, a bulb containing a liquid, a vessel communicating with the bulb and having a horizontal cross section less than that of the bulb and containing a liquid such as mercury, of which the'level varies with changes of volume of the liquid contained in the bulb, a pressure controlled device for indicating temperature, a, tube connecting theinterior of the lower end of the vessel with thewpressurecontrolled device, and means for forcing air through the connecting tube andinto. the liquid, 'in the vessel;

In testimonywhereof we, have signed our names to i this specification;

JAMES TBEvELYAN. Fox.

ARTHUR, JENNENS1MALONE 

